#include<iostream>

long long int compute ( double y)
{
    return y * 63240;
}

int main()
{
    using namespace std;
    double y;
    long long int a;
    cout << "Enter the number of light years:";
    cin >> y;
    a = compute(y);
    cout << y << " light years = " << a << " astronomical units."<<endl;

    return 0;
}